/// <summary>
/// Main controller to create a shortened URL.
/// </summary>
/// <param name="link"></param>
/// <returns>JsonpResult</returns>
public JsonpResult Shorten(Link link)
{
if (!string.IsNullOrEmpty(link.DestinationUrl))
{
if (IsUrlValid(link.DestinationUrl)) //Check to see if the URL is valid.
{
//This will test to see if the user wants to use a custom code by passing in an ID value in the URL
//Example Shorten\mycode\callback?
if (String.IsNullOrEmpty(link.ShortCode) && RouteData.Values["id"] != null)
{
link.ShortCode = RouteData.Values["id"].ToString();
}
//Check to see if short code in use
if (!String.IsNullOrEmpty(link.ShortCode))
{
//If short code is found in database, notify the user.
if (db.Links.Where(i => i.ShortCode == link.ShortCode).Count() > 0) return GetLinkAsJSONP(null, "The short code " + link.ShortCode + " already exists.");
}
Link ExistLink = db.Links.SingleOrDefault(l => l.DestinationUrl.Trim().ToLower() == link.DestinationUrl.Trim().ToLower());
if (ExistLink != null)
{
return GetLinkAsJSONP(ExistLink, "");
}
else
{
Link newLink = new Link();
newLink.LinkID = Guid.NewGuid();
newLink.DestinationUrl = link.DestinationUrl;
newLink.AccessCount = 0;
newLink.DateCreated = DateTime.Now;
newLink.LastAccessed = DateTime.Now;
if (String.IsNullOrEmpty(link.ShortCode))
{
newLink.ShortCode = CreateUnusedShortCode();
}
else
{
newLink.ShortCode = link.ShortCode;
}
db.Links.Add(newLink);
db.SaveChanges();
return GetLinkAsJSONP(newLink, "");
}
}
}
return GetLinkAsJSONP(null, "Please provide a valid URL such as http://www.google.com.");
}
/// <summary>
/// Returns a link as JSONP
/// </summary>
/// <param name="link"></param>
/// <param name="message"></param>
/// <returns></returns>
private JsonpResult GetLinkAsJSONP(Link link, string message)
{
JsonpResult result = new JsonpResult();
if (link != null)
{
var data = new
{
Success = true,
ShortURL = this.BaseURL + link.ShortCode,
AccessCount = link.AccessCount,
OriginalURL = link.DestinationUrl
};
return new JsonpResult(data);
}
else
{
var data = new
{
Success = false,
Message = message
};
return new JsonpResult(data);
}
}
